Tenant moved in her boyfriend and I want him out.

[Ben Morris]

I Rented a house to a lady with three kids back in August. Only she was screened, therefore only her name is on the lease. In September she moved her boyfriend into the house. I didn't have a problem with it until they were unable to provide proof of employment for him. I did get a copy of his license, which has the rented house as the address and issue date in September. So now I want him out. FYI the house is in PA. 

Thoughts?